org.elasticsearch.search.Scroll Maven / Gradle / Ivy
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search licenses this
* file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search;
import org.elasticsearch.util.TimeValue;
import org.elasticsearch.util.io.stream.StreamInput;
import org.elasticsearch.util.io.stream.StreamOutput;
import org.elasticsearch.util.io.stream.Streamable;
import java.io.IOException;
import static org.elasticsearch.util.TimeValue.*;
/**
* A scroll enables scrolling of search request. It holds a {@link #keepAlive()} time that
* will control how long to keep the scrolling resources open.
*
* @author kimchy (shay.banon)
*/
public class Scroll implements Streamable {
private TimeValue keepAlive;
private Scroll() {
}
/**
* Constructs a new scroll of the provided keep alive.
*/
public Scroll(TimeValue keepAlive) {
this.keepAlive = keepAlive;
}
/**
* How long the resources will be kept open to support the scroll request.
*/
public TimeValue keepAlive() {
return keepAlive;
}
public static Scroll readScroll(StreamInput in) throws IOException {
Scroll scroll = new Scroll();
scroll.readFrom(in);
return scroll;
}
@Override public void readFrom(StreamInput in) throws IOException {
if (in.readBoolean()) {
keepAlive = readTimeValue(in);
}
}
@Override public void writeTo(StreamOutput out) throws IOException {
if (keepAlive == null) {
out.writeBoolean(false);
} else {
out.writeBoolean(true);
keepAlive.writeTo(out);
}
}
}